What i liked:
- Good visual, minimalistic, but readable
- Nice music, enjoyable, but not distracting. Sounds like it's 90-s again! =D
-Fast gameplay, idea of including player avatar, that can perform in fight allow avoid this "okay, i placed towers, now i'm gonna get a cup of tea" moment
What seems not finished:
-A bit disbalance in weapon. When first and second (1 bullet, 3 bullet) guns feels like they are doing nothing, cannon from robots on two turrets leads to automatic win. Flowers are feels to strong - you just can't leave the spawn, if there are more than 3-4 of them
-Map logics. Mostly all right, but one of the maps (8 or 9) have two spawns in different corners, in early game, when turrets cant do anything, it provides unavoidable damage - you just cant be in two places
-Maps themselfs. A bit more variants of background would be nice.
-Weapon sprites hoardes on the floor, making picking once specifict almost impossible.
Finally, good and, mostly important, enjoyable game, providing a bit challenge. Awesome work!